Polycab SPN RCBO 300 mA – C-Curve 10 kA RCBO (1 pole + N), 6 A to 63 A, IS 12640-2

The Polycab SPN RCBO 300 mA is a residual current circuit breaker with overcurrent protection (RCBO) for a single-phase circuit: a single 1P+N device that trips on earth leakage at 300 mA and on overload or short circuit with a C curve and 10 kA breaking capacity, made to IS 12640-2 / IEC 61009-1. Polycab lists it in 8 ratings - 6, 10, 16, 20, 25, 32, 40 and 63 A - at MRP Rs 4,446 to Rs 5,639 per piece (polycab.com, October 2026).

Polycab India Limited is India's largest manufacturer of wires and cables, with 27 manufacturing facilities, 4,300+ authorised distributors, 2,00,000+ retailers and an export presence in 84 countries (polycab.com, October 2026). Its switchgear range covers MCBs, RCCBs, RCBOs, isolators, changeover switches, ACCLs and distribution boards. Jai Enterprises supplies Polycab RCBOs from Bhilai and Raipur all over Chhattisgarh - Bhilai, Raipur, Durg, Korba, Bilaspur, Raigarh, Jagdalpur, Kanker, Ambikapur and every other district - and across India.

Is this the right one for you?

Check these four things before you order:

• You want earth-leakage and overcurrent protection for a single-phase circuit in one device (single pole and neutral).
• 300 mA suits the circuit: fire protection of the circuit it feeds.
• A C curve suits the load - general and mixed loads such as ACs, pumps and lighting banks.
• The rating you need is one of 6, 10, 16, 20, 25, 32, 40 and 63 A and the fault level at the board is within 10 kA.

At a glance

• MRP: Rs 4,446 - 5,639 per piece (polycab.com, October 2026, inclusive of taxes)
• Product: Polycab SPN RCBO 300 mA
• Type: RCBO - RCCB and MCB in one device
• Poles: SPN - single pole and neutral (1 pole + N)
• Sensitivity: 300 mA
• Tripping curve: C
• Breaking capacity: 10 kA
• Ratings: 6, 10, 16, 20, 25, 32, 40 and 63 A
• Standard: IS 12640-2 / IEC 61009-1
• Item codes: GMB301N001 to GMB301N008

Ratings, item codes and MRP

• 6 A: item code GMB301N001 - MRP Rs 4,446
• 10 A: item code GMB301N002 - MRP Rs 4,446
• 16 A: item code GMB301N003 - MRP Rs 4,446
• 20 A: item code GMB301N004 - MRP Rs 4,446
• 25 A: item code GMB301N005 - MRP Rs 4,446
• 32 A: item code GMB301N006 - MRP Rs 4,446
• 40 A: item code GMB301N007 - MRP Rs 4,725
• 63 A: item code GMB301N008 - MRP Rs 5,639
• MRP basis: MRPs as listed on polycab.com, October 2026, inclusive of taxes; the selling price is confirmed on enquiry

Why choose the Polycab SPN RCBO 300 mA

• Real trip indicator - shows when it has tripped on a fault
• Test button to check the device
• Lockable knob for safe maintenance
• Air-flow channels
• Functionally independent of line voltage (electromechanical) - it does not depend on the supply voltage to trip
• Mid-trip handle (dolly) position after a trip
• Bi-stable DIN clip for easy installation
• Contact position indicator and neutral marking (Polycab catalogue)
• One device per circuit, so an earth leakage on one circuit need not switch off the rest of the board
• Polycab item code and MRP for every rating - GMB301N001 to GMB301N008

How to choose and fit it

Two protections in one. The RCBO trips on earth leakage at 300 mA, like an RCCB, and on overload and short circuit with a C curve (instant trip at 5 to 10 times its rating), like an MCB.

Why per-circuit RCBOs. When each circuit has its own RCBO, an earth leakage on one circuit switches off only that circuit - provided the board's incomer has no RCCB that trips on the same leakage. With one RCCB for the whole board, every circuit behind it goes off.

Sensitivity. 300 mA is used for protection against fires started by earth-leakage currents on the circuit it feeds; it does not protect people against electric shock. Polycab makes this RCBO in 30, 100 and 300 mA.

Rating. Choose a rating above the normal current of the circuit and within the current-carrying capacity of its cable, as for an MCB.

Testing. Press the test button regularly - many electricians advise once a month - to check that it still trips.

Where it is used

• single-phase circuits and sub-mains where fire protection, not shock protection, is the aim
• circuits that should stay on when another circuit develops an earth leakage
• used with 30 mA devices on the circuits where people need shock protection

Other Polycab RCBOs

• Polycab SPN RCBO 30 mA - 6 A to 63 A, MRP Rs 4,286 - 5,520
• Polycab SPN RCBO 100 mA - 6 A to 63 A, MRP Rs 4,446 - 5,639
• Polycab SPN RCBO 300 mA (this page) - 6 A to 63 A, MRP Rs 4,446 - 5,639
• Polycab TPN RCBO 30 mA - 6 A to 63 A, MRP Rs 5,592 - 6,090
• Polycab TPN RCBO 100 mA - 6 A to 63 A, MRP Rs 5,081 - 6,227
• Polycab TPN RCBO 300 mA - 6 A to 63 A, MRP Rs 5,081 - 6,227

Related products

• Polycab DP RCCB 300 mA - earth-leakage protection only, for a whole board
• Polycab 10kA C-Curve SPN MCB - overcurrent protection only
• Polycab SPN double-door distribution board
• All Polycab switchgear

Frequently asked questions

What is the difference between an RCBO and an RCCB?

An RCCB trips only on earth leakage and needs an MCB for overload and short circuit. An RCBO does both jobs in one device, so one breaker gives a circuit earth-leakage, overload and short-circuit protection.

What does 300 mA mean?

It is the earth-leakage current at which the RCBO trips. 300 mA is used for protection against fires started by earth-leakage currents on the circuit it feeds; it does not protect people against electric shock.

Can an RCBO replace an MCB?

Yes - it has a C-curve overcurrent trip with a 10 kA breaking capacity, so it protects the circuit against overload and short circuit as an MCB does, and adds earth-leakage protection.

Which ratings are available?

6, 10, 16, 20, 25, 32, 40 and 63 A, all C curve, 10 kA, in 300 mA. Polycab also makes the SPN RCBO in the other two sensitivities.

What is the MRP of the Polycab SPN RCBO 32 A 300 mA?

Rs 4,446 per piece, item code GMB301N006 - the MRP listed on polycab.com in October 2026, inclusive of taxes. Call +91 9340081159 for the selling price and stock.

Where can I buy the Polycab SPN RCBO 300 mA in Chhattisgarh?

From Jai Enterprises, Bhilai and Raipur, which supplies Polycab switchgear all over Chhattisgarh - Korba, Bilaspur, Raigarh, Jagdalpur, Kanker, Ambikapur and every other district - and across India. Call +91 9340081159 with the rating, quantity and delivery location and we will confirm the price, stock and lead time.

How to order

Supplied by Jai Enterprises, Bhilai and Raipur, to every district of Chhattisgarh and across India. Polycab lists the SPN RCBO 300 mA at MRP Rs 4,446 - 5,639 per piece (polycab.com, October 2026, inclusive of taxes). Call +91 9340081159 or send an enquiry from this page with the rating, the quantity (pieces) and the delivery location, and we will confirm the selling price, stock and lead time.